linux-kernel - Re: [PATCH v2] gpio: mention in DT binding doc that <name>-gpio is deprecated

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Message-ID: <CAL_JsqL9FCGAy-9o_4M+hhG7MVB6MX8i5JJyNBnM3fPezVrYdQ@mail.gmail.com>
Date:	Fri, 25 Sep 2015 13:32:32 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>, Benoit Parrot <bparrot@...com>,
	Kumar Gala <galak@...eaurora.org>,
	Masahiro Yamada <yamada.m@...panasonic.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2] gpio: mention in DT binding doc that <name>-gpio is deprecated

On Mon, Sep 21, 2015 at 7:57 AM, Javier Martinez Canillas
<javier@....samsung.com> wrote:
> The gpiolib supports parsing DT properties of the form <name>-gpio but it
> was only added for compatibility with older DT bindings that got it wrong
> and should not be used in newer bindings.
>
> The commit that added support for this was:
>
> dd34c37aa3e8 ("gpio: of: Allow -gpio suffix for property names")
>
> but didn't update the documentation to explain this so it's been a source
> of confusion. So let's make this clear in the GPIO DT binding doc.
>
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

Applied. Thanks.

Rob

>
> ---
>
> Changes in v2:
> - Explain that <name>-gpio is deprecated instead of saying that is
>   supported. Suggested by Alexandre Courbot.
>
>  Documentation/devicetree/bindings/gpio/gpio.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt
> index 5788d5cf1252..82d40e2505f6 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio.txt
> +++ b/Documentation/devicetree/bindings/gpio/gpio.txt
> @@ -16,7 +16,9 @@ properties, each containing a 'gpio-list':
>  GPIO properties should be named "[<name>-]gpios", with <name> being the purpose
>  of this GPIO for the device. While a non-existent <name> is considered valid
>  for compatibility reasons (resolving to the "gpios" property), it is not allowed
> -for new bindings.
> +for new bindings. Also, GPIO properties named "[<name>-]gpio" are valid and old
> +bindings use it, but are only supported for compatibility reasons and should not
> +be used for newer bindings since it has been deprecated.
>
>  GPIO properties can contain one or more GPIO phandles, but only in exceptional
>  cases should they contain more than one. If your device uses several GPIOs with
> --
> 2.4.3
>
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